bruce



Nov. 2, 1926.

d Re, 16,451 A. w. BRUCE Loc'oMo'TIvE TRAILING TRUCK 2 sheets-sheen' l original Filed Sept. 20, 1924 Reissued -.N,ov. 2, 1926.

; UNITED STATES` Arrmmw. BRUCE, oF NEW yonx, N. Y.

LOCOMOTIVE TRAILING TRUCK.

Original No. 1,529,986, dated Barchi?, 1925, Serial No. 738,822,11ed September 20,- 1924. Application for l reissue led vAugust 31, 1926'. Serial No. 132,848.

The object of my invention isto provide a four wheeled trailing truck, which shall be of strong and simple design; ready ap-v plicability below the 'firebox of a.' locomotive boiler; capacity for supporting a booster or analogous device, in the usual manner; and which, in p'assingcurves, shall operate similarlyjto a two-wheeled truck,'the two addiv In. the accompanying drawings Figure.

l5 1 is a side view, in elevation, of the'rear -portion of a locomotive engine, illustrating an embodiment of myinvention; Fig. 2,'a half plan View, with the firebox removed; Fig. 3, a vertical transverse section, the right hand 'and' left hand halves of which are taken on the lines a a and b b, respectively, of Fig. 1; Fig. 4, a half plan view, partly in section of the front axle and adjoining side frame-member; and, Fig. 5, a side View, in elevation, of the same. l

In the practice of my invention, referring deszriptively .to the lspecific embodiment thereof which is herein exemplified, the truck frame is `an integral casting, comprising two parallel side members, 1, 1, a transverse rear member, l, connecting the side members; and a forwardly and inwardly inclined front member, 1b, extending from the side members to the longitudinal central plane ofI the truck, and having a forwardly projecting radius bar, 1e, at its middle, socketed to receive a centre pin. The radius bar is coupled bya centre pin, in the usual manner, to a cross tie, 3b, securedto the side member, 3, of the main frame of the vlocomotive and to the supplemental frame members,.3a, which extend rearwardly therefrom, above the truck frame. I y

The truck is supported on a pair` of truck wheels, 4, which are fixed on a forward supporting trucktv axle, A4, journall'ed in axle boxes, 4b, itte,in the side members of the frame,- adjacent to their forward ends, and on a pair truck wheels, 44, of larger diameter, which are fixed'on a rear guiding truck axle 44, Iof larger diameter `than the supporting truck axle, the guiding truck axle, 44, being jo-urnalled in the side members of the frame adjacent to their rear ends. As 'clearly shown in Figs.'v 4 and 5, the

clalmed is hereinafter,

supporting axle, 4, is mounted in the truck frame with the capacity of lateral movement relatively thereto. Various devices for affording such lateral movementare known in the art,and any suitable and preferred form may be applied, in the discretion ofthe con-A structor. In the instance herein shown,'the supporting axle, 4, rotates inv axle boxesf,14", the bearing length of which is sufficiently greater than the width of the frame pedestals, to afford the desired and determined' degree of lateral motion. Pressure, resist# ing outward movement of the axle,4*, in

either direction, is exerted upon th'eaxleA boxes, 4b, by helical spring, 16, coiled on and bearing, at one end,'on`f1anges,'4c.on the axle boxes, adjacent to their outer ends, and, at the other, on bearing plates, 16, secured adjustably on the stems, 16". The rear stems, 16", fixed inthe side frame members,

guiding axle, 44", is, as in ordinary practice, I

allowed a limite'd degree of lateral motion,

which, as indicated in the dra-wings, is lesser in degree than` that 0f the front axle, 4%.'

The proportion of the weight of the loco` motive which is carried by the truck is transmitted from the supplemental main frame members, 3a, to the side members, 1, 1, of

the truck frame, through any suitable and preferred device-for permitting and con trolling swinging movement of the truck,

different types of which are known to con-v f structors of locomotives. In the Ainstance exemphfied,lthe transmission of weightA is Veffected through transmission arms, 10,

formed on, or fixed to, the supplemental-V frame members, B, and projectingA outwardly therefrom, ata forward inclination, in a. suitably determined location in rear of the supporting truck axle, 4. Reversely inclined bearing faces, 10a, on the'transmission arms, abut on rockers, 11, which aref-fitted to swing on the side members, l, 1,0f the truck frame, the relation of the bearing faces and rockers opposing the resistance `to lateral movement which is requisite to permit and control the swinging movements of the truck in a manner well knownin practice.

" .The weight' carried by the truck frame acts upon the axle boxes, through springs, G, bearing thereon, and coupled by intermediate truck equalizers, 5, pivoted on the side members of the truck frame, the opposite ends of the springs being linked to the side y members by spring hangers. The rear drivforward axle and Wheels, being afforded lat-` eral motion, `perform a supporting function ing wheels, 7, of the locomotive, are fixed 4on an. axle, 7, which` isvtted in'boxes in the main frame, 3, in the ordinary' manner, the supported Weight being transmitted to` the drlving boxes through springs, 8. The' truck, as a Whole,'is equalized with therear driving wheels, in a manner known in the art. Y

My invention attains, in practice, the -slibstantial advantage of increasing the carrying capacity of a trailing truck above that of a two Wheeled truck, by the'application of anl additionalaxle ,and pair of wheels,

while maintaining thesai'ne tracking action, in' passing. overl curved track, as that of a two wheeled truck, forthe reason. that the "fonly, and the tracking of the truck, as a Ajournal A grecs, relatively, of-lateral motion.

whole, is effected by the rear guiding axle. and wheels,'whi'ch are preferably, as shown, made ot largei'diameter to be better adapted tothe performance vof their guiding function. f l y.

I claim 'as' myV invention'and desire to ."ccure by Letters Patent: ,a

l. In .a.l ocomotiv'e'engine, the combina'- tion of a trailing'. truck `frame; a forward`- supporting axle and. wheels; and a rear tracking axle-and lwheels, said axlesbeing ed vin the frame with different 2. Inal locomotive engine, the combination of a trailingtruck frame; a forward supporting axle and wheels, jonrnalled,`wi th the capacity oflateral motion,'in said frame; and a reartracking axle and Wheels, journalled, with a lesser degree of lateral motion y [ALFRn vv;- BRUCE. 'i

Athan the supporting axle and wheels, in said frame.

3. In a locomotive engine, thecombina-` tion of atrailingtruck frame; a forward supporting axle. and wheels, journalled therein; a lateralmotion device, operative on said forward .axle; and a rear tracking axle and Wheels,jjonrnalled in the truck -frame.

4. In a locomotive engine, the combination 'of a trailing truck frame; a forwardv supporting axle and lWheels, journalled therein; a lateral motion. device, operative on said forward axle; and-"a rear tracking axle 4and.

wheels, of greater diameter than the supporting axle and-,"Wlieels,journalled in the j truck lframe. f

5. In a locomotiveengine, the combination of a trailing trirckframe; a forward supporting axle anlfvvheels; axle boxes fitted.

in said frame, in w'vhich said axle is joirfor permitting and controlling relative lat` -eral movement-of the latter; aV forwardA supporting axle' and wheels, jouinalled in the' truck frame; a lateral motion' device, operative on said forward axle; Ianda rear track-.

ing Vaxle and Wheels, journalled inl the truck 

